Apparatus for receiving submarine signals.



G. H. MUN DY.

APPARATUS FOR RECEIVING SUBMARINE SIGNALS.

APPLICATION FILED APR. 21, 190B.

Patented Jan. 5, 1909.

a //vv/vr0/r zaz-Zeajf. Man 625 19 board sh1 for the interception owarning ing drawing seems TRUs'rEaoF NEWTONVIIJLE, ms'saouuss'rrs,

I APPARATUS FOR RECEIVING Specification of Letters Patent;

. r atented J'an.,5,-1 909.

Application filed Apr-i121, not. sum na'asaaav.

To. who'lfi'it may concern: I

Be it-known that 51, CHARLES H. MUNDY,a.'-

citizen'ofthe'United'States, and a-resident-of Metuchen, in the countyof Middlesex: and

full, clear, and exact'description.

ThlS invention is an improvement in submarine signal receivers such asare laced on sounds. uch devices as now exist' or heretofore-suggested,may be divided into three different olasseszdirst, ap i lairatus to belowered over theside of the s 'p into the water; second, apparatusfastened to the outside skin of the ship,

from within; and'thir a paratus fastened to the inside skin of the s pand accessible from within. The first class yields the best results inso far as loudness and-distinctness of sound is concerned, and the.third classis-in these respects the least-efficient yet the latter hasbeen adopted in commercial use hestorm- =weather 'w e the ship is inmotion, as-we :as its liabilitystodnjury. The second classalthou hpresenting :all of the advantages of the st, with the additionaladvantagte that it is unaffected b stormy weather, is, owever,objectionable or the reason that. it isinaccessible for the purpose ofmaking irepairs, etc. I 1 .My invention belongs to-a fourth-classof thisart, which possesses all the advantages others,- the same consisting ofa sound transmitter exposed :directly to the sea and acces-- s ble from,within the ship, and is distin- 40 guished fromotherinventionsofithis-class in that the transmitter proplpr may be removed andreplaced while the s 'p is afloat without ta water the ship.

*Re erence-is to be had :to the. -accompany-.

s forming a part of this-specification, in which similar characters-ofreference indicate corresponding'parts in *both views.

-- Figure 1 1s a central-.-'v ertical sectionthrougha' submarinereceiving apparatus :ap-

plied toa ship gmd'embodyingray-invention;

and 2 a. fragmentary sectional view -illustrating a sli'ghtmodification. 7 .Incarrying ut invention chamber preferably a cylinder5, which is 56 bolted -.or. otherwise secured to the insidezof but notaccessible causeof the difficult of handling the first inenumerated ofthe'first three classes and.

thehull or skin ofthe ship, in register fithain mmng'os METUGH'EN," NEWiERs EY-,,Ass1eNoRro stem B. Y,

plpenin gm formed the latter, which, :as V

own Fig-.'"1.,':is :ofta;perin form with :the

enlarged portion at-the insi e. Dhis cylin- Jder may be installedart-any point-on the hull below the waterline, as, for-exam le, in thecut water on :the bow of the vesse .in which position soundsahead-andf'rom either aided 'the ship would be heard withequal-olearness.

Movab e the -cy linderis a piston 6, the head of which is hollowand-captains any of the usual or other form=of transmitter .7, inclosedon the front by the diaphragm 8, which, by reason of the opening in thehull, is exposed directly to the sea.

The piston head of aform to closely fit the opening in the hull,"andwhen firmly pushed to its seat in =thatt ezof the inven--' tion shown-in 1., will e substantially flush with the ho l?s outer surface. If thepiston head he made of metal, such as brass,

and the hull :be-of iron, 'it is desirable that a gasket of rubber orsome equally. efiicient substance, 9, be placed about the piston inorder to avoid electrolysis; said gasket also ser :asaoushion betweenthe receiver-and the slmnof lthe ship so as to give close pho: neticcontact :between them, and in any -.case there should be one ormoregrooves between the piston head and theskinof the ship,- sees topermit-"free. assagaofwater:firomthe open sea into the c amber when the:piston head or receiver :is pressed into positionzand flush withtheoutsideskin of the ship.

The inner end ofthecylinder-is closed by-a removable head .1 0 xhawin astufiing box 11 through which 'the stem 0 the piston spasses, formingtherewith-a'water-tight joint aroimd the head. -On the outside of thehead :is threaded or otherwise zadjustahly attaohed, la thimble '512which -operates when screwed :up to firin'l force ithe piston head toitsseatin the hul of (the Slflp. The rpiston stem, :it will be observed,isLmade hollow, "and the .thimble 12 ipfi oyided witharegistering'eemtral opening doctors lea ough which pass electric-comfrom .thetransmitter to the,

telephone receiver, which is ordinarily ilo -f :point 'of theoyrlinder,preferably ear itsman- -ter, a vralweis rovided,which'1 ave shoiwzninthe form 0 an'ordinary gate valwze com- .I p'rovideia.

oatedinitheipilot'house. .ihtianlintermedaate enlargement in'thecylinder. The head 13 is operiated by a screw 15, revolubly mounted inthe top of adome 16, which latter is secured to the cylinder over theopening therein. through which the gate valve moves.

After the apparatus thus far described is installed in the ship it ispreferably inclosed in-a casing 17, which, in t e presentform of theinvention shown, is provided with a hin ed door 18, at the front,adapted to be hel in closed position by a thumb latch 19; the easingalso having openings, respectively for the passa e of the conductors andfor the operation 0 the gate valve.

In some instances it may be found desirable to protect the transmitterfrom sea growth and other deranging influences from without, for whichpurpose I have shown in Fig. 2, a screen 20 arranged over the openinginthe hull of the shi .In this particular form of the invention s own, thetransmitter is not designed to be brought flush with the outer surfaceof the hull, as in the type of the invention illustrated in Fig. 1, butit may be placed in whatever position in the cylinder it may be found byactual test to be the most desirable. The cylinder ma be considered as aresonating chamber, an the pro er position of the transmitter thereinwill spend upon the pitch of the sound received from the bell signa Thetransmitter ma be easil focused td meet the conditions 0 any. itc bymerely increasing or decreasing the istance between the transmitterdiaphragm and the hull of the ship. When the screen is not used, it willbe referable to osition the transmitter asu'strated in ig. 1, as bysetting it back within the cylinder, in the absence of the screen, awhistling sound is likel to result,

or if projected ever so slightlly yond the earn outer surface of thehull, the c ess of the signal would be impaired by the flow of the wateragainst the transmitter. When it is desired to cleanthe'transmitter',the thimble 12 is removed after opening the door 18 and turning it backupon the inclined portion of the casing, in which position it willremain under the action of its own weight. The piston ma then beretracted to the limit of its inwar ,movement, as shown" in dottedoutline in Fig. 1, after which\ the gate valve is lowered, cutting ofBthe rear of the cylinder from the .open sea, when "the cylinder headmay. be detached and the piston removed. If-the opening in the hull ofthe ship has become in any wise'fouled, the piston may be replaced by adummy piston or plunger, and t placed in osition and thew: orce out t ecollected gfo h. In this way the transmitter may be. ept inperfect'order, and the apparatus will in no wise be rendered lessefficient after long usage, if it is given the proper attention. a

e latter used after the :ylinder head is ve opened, to-

'- The ap aratus, it will be observed, is not only ren ered moreefli'cient by presenting the transmitter directly to the sea, but thisefliciency is augmented when the iston is forced to its seat, by reasonof t e close phonetic contact with the skin of the ship,

which acts as a sound collector; and, under my invention, I secure byLetters tween the opposite ends thereof.

2. The combination of a cylinder adapte to be secured within the hull ofa ship in communication with the sea, a detachable head covering one endof the cylinder, and a piston having a stem slidable through said eadand provided with a sound transmitter.

1 3. The combination of a cylinder havin one end thereof open, adetachable head covering the b poslte end of the cylinder, 9. Ipistonmovab e in the cylinder, havinlg a' ollow head and provided with a ho owstem passing through said head, and a sound transmitter arranged withinthe hollow piston, having con uctors passing therefrom throu h thehollow stem. r

4. n combination with a ship having an opening in the .hull thereofbelow the water line, a chamber secured within the ship in communicationwith said .ope and a piston movable in the chamber, a apted to seat insaid opening and provided with a sound transmitter.

5. In combination with a ship having an opening in the hull thereofbelow the water line, a cylinder secured within the shi in commumcationwith said opening, a. ead covering the inner end of the cylinder, apiston within the cylinder slidable through said head and provided witha sound trans-' mitter, and means carried by the head of the cylinderfor forcing In combination with a ship having an opening in the hullthereofbelow the water the piston to said openhne, a cylinder. securedwithinwethe shipdncommumcation with said opening, asound transmitterwithin the cylinder movable'to and from said-o ening', and means.intermediate the cylin er for cutting ofi communication between its oposite ends.'

- 7. The combination 0 a chamber, a sound transmitter within thechamber;- movable is the communication between the opposite ton betweenit and said head.

der slidablein said head,a sound transmitter carried by the piston, acasing inclosing cylinder and operable from the outside of the casing.

lon itudinally thereof, and means interme ,iate the length of thechamber for cutting ofi' communication between its opposite ends.

8. The combination of a cylinder, a sound transmitter movable within thecylinder longitudinally thereof, and a gate valve movable transverselyto the cylinder at an intermediate point thereof for cutting off thecommunication between the opposite ends of the cylinder.

9". The combination of a cylinder having a detachable head, a pistonwithin the cylinder slidable in said head, a sound transmitter carriedby the piston, and a valve for cutting off the communication between theopposite ends of the cylinder, with the pis- 10. The combination of acylinder having y a detachable head, a piston within the cylin-.

the cylinder, anda gate valve also inclosed by the casing for cuttingofi the communication between the opposite ends of the 11. Thecombination of a ship having an opening in the hull thereof below thewater line, a cylinder secured within the hull over said opening, havinga detachable 'head at its inner end, a piston within the cylinderslidable in said head, means for cutting ofl ends of the cylinder,a'sound'transmitter two subscribin carried by the piston, and a casingcovering thecylinder having a door providing access to the cylinderhead.

12. In combination witha ship, a sound transmitter movable in, removablefrom and" the casing, movable to and from said open-,

1.4. A casing having an inlet opening through which water 1s adapted topass, said casing being otherwise water-tight, a sound transmitterwithin the casing, and a valve for cutting oil" the water in the casingbetween said opening and the transmitter. 15. In combination with aship, a sound transmitter exposable to the. water without the ship, and'means reventing the inflow of water within the s 'p when saidtransmitter is removed. p

In testimony whereof I have signed my name to this specification in thepresence of witnesses. CHAR ES HOSKINS MUNDY. Witnesses:

ELBRIDGE F. HILLS, STAcY R. Hum.

